#
include < avr / sfr_defs.h > #include < avr / iom128.h > #include < avr / io.h > #include < string.h > #define CELL_OFF 0x00# define SEGMENT_A# define SEGMENT_B# define SEGMENT_C# define SEGMENT_D# define SEGMENT_E# define SEGMENT_F# define SEGMENT_G# define SEGMENT_H# define SYMBOL_Br(SEGMENT_A | SEGMENT_C | SEGMENT_D | SEGMENT_E | SEGMENT_F | SEGMENT_G)# define SYMBOL_Gr(SEGMENT_A | SEGMENT_E | SEGMENT_F)# define SYMBOL_Ur(SEGMENT_B | SEGMENT_C | SEGMENT_D | SEGMENT_F | SEGMENT_G)# define SYMBOL_Ir(SEGMENT_B | SEGMENT_C | SEGMENT_D | SEGMENT_E | SEGMENT_F)# define SYMBOL_Rr(SEGMENT_A | SEGMENT_B | SEGMENT_E | SEGMENT_F | SEGMENT_G)# define TOGGLE_CLK()(PORTC |= _BV(PC3), \
  PORTC &= ~_BV(PC3))# define STRING_RUN_PERIOD 3000
static uint8_t aunVideoMemory[] = {
  0,
  0,
  0,
  0,
  0,
  0,
  0,
  0
};
static uint8_t aunRunningString[] = {
  0,
  0,
  0,
  0,
  0,
  0,
  0,
  0,
  SYMBOL_Rr,
  SYMBOL_Ir,
  SYMBOL_Ur,
  SYMBOL_Gr,
  SYMBOL_Br,
  0,
  0,
  0,
  0,
  0,
  0,
  0,
  0,
};
const uint8_t unVMSize = sizeof(aunVideoMemory) / sizeof(uint8_t);
const uint8_t unRSSize = sizeof(aunRunningString) / sizeof(uint8_t);
int main(void) {
  uint8_t unDispCell = 0;
  int32_t nDelayIn, nDelayOut;
  int16_t nSymbol = 0;
  DDRA = _BV(DDA0) | _BV(DDA1) | \
    _BV(DDA2) | _BV(DDA3) | \
    _BV(DDA4) | _BV(DDA5) | \
    _BV(DDA6) | _BV(DDA7);
  DDRC = _BV(DDC0) | _BV(DDC1) | \
    _BV(DDC2) | _BV(DDC3);
  while (1) {
    nDelayOut = STRING_RUN_PERIOD;
    memcpy(aunVideoMemory, aunRunningString + nSymbol, unVMSize);
    while (--nDelayOut > 0) {
      PORTC = unDispCell;
      PORTA = ~(aunVideoMemory[unDispCell++]);
      unDispCell %= unVMSize;
      TOGGLE_CLK();
      for (nDelayIn = 0; nDelayIn < 5; nDelayIn++);
      PORTA = ~CELL_OFF;
      TOGGLE_CLK();
    }
    if (--nSymbol < 0) {
      nSymbol = (unRSSize - unVMSize);
    }
  }
  return 0;
}